A small ring is rolling without slipping on the circumference of a large bowl as shown in the figure. The ring is moving down at `P_(1)`, comes down to the lower most point `P_(2)` and is climbing up at `P_(3)`. Let `vecv_(CM)` denote the velocity of the centre of mass of the ring. Choose the correct statement regarding the frictional force on the ring.

Options

A. It is opposite to `vecv_(CM)` at the points `P_(1), P_(2)` and `P_(3)`.
B. It is opposite to `vecv_(CM)` at `P_(1)` and in the same direction as `vecv_(CM)` at `P_(3)`
C. It is in the same direction as `vecv_(CM)` at `P_(1)` and opposite to `vecv_(CM)` at `P_(3)`.
D. It is zero at the points `P_(1), P_(2)` and `P_(3)`.

Answer

B